Hey guys, im working on a 00 silverado 5.3 motor thats using coolant too fast. I change the oil in it two days ago and it had water or coolant in the oil !! The truck never ran hot as long as I had it. IM HOPING ITS NOT A BLOWN HEAD

WHEN you pull the heads. Have them checked for warp/flat. AND have them pressure checked.

I get a lot of these that are cracked along the upper row of head bolts. Topside, where the casting is machined for the head of the bolt. HARD to find with naked eye. But, bubbles like crazy with p-check..

Hey guys, im working on a 00 silverado 5.3 motor thats using coolant too fast. I change the oil in it two days ago and it had water or coolant in the oil !! The truck never ran hot as long as I had it. IM HOPING ITS NOT A BLOWN HEAD

Yep...should have said LM4 or one of the 6 others. I only remember LQ4 because that is what my Father in law has and im always working on it.

Either way he needs to look at the head gaskets and/or heads for the coolant leak.

I agree. After checking the differences in the sbc i see what you are talking about. You are correct.
I work on so many different cars that I really dont even pay much attention to them. Only when I am assembling one, after that its 5:00 somewhere...LOL.

Its getting to be there are as many different SBCs as there are carmakers.

There were some early GenIII heads that leaked coolant near the front and rear drain backs. The water jacket wall got a little thin and had porosity issues. What casting number are the heads? The last 3 digits of the casting number should be visible above the exhaust flange. It's cast in, not stamped or etched. should be could be 706 or 753, or something like that. Either way, it's time to pull the motor. If you have that much white stuff, it's likely you have some damage to the bearings. It's good insurance to pull it apart and check before the crank gets chewed up. Good news is that 5.3's are pretty darn cheap in the boneyard. I picked a good one up with a bad lifter for $200. Guy thought it had a spun bearing, but the journals are great.

Yea I thought it would be that the heads were cracked too because the new style LS motor don't have water going through the intake. I pressure test it and it didn't leak down so ima do a head job and hope I can save my baby THANKS GUY

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